Mechanisms of Evolution

This is the process that ultimately creates new variations and changes in DNA; leads to the creation of new alleles

• Mutation

• Microevolution

• Natural selection

• Gene flow / genetic drift

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A bee carrying pollen from one flower population to another flower population.

• gene flow

• natural selection

• bottleneck effect

• founder effect

Thanks to a better food source, giraffes with longer necks were able to survive to reproduce and so passed on the characteristic to the succeeding generation.

• gene flow

• natural selection

• bottleneck effect

• founder effect

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• Gene flow

• natural selection

• bottleneck effect

• founder effect

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Northern elephant seals have reduced genetic variation because of humans hunting them in the 1890s. Hunting reduced their population size to as few as 20 individuals at the end of the 19th century.

• Gene flow

• natural selection

• bottleneck effect

• founder effect.

Which option is an example of Genetic Drift?

• Mutation

• Bottleneck Effect

• Adaptation

• Finders Keepers

What occurs when members of one population migrate and interbreed with another population.

• Mutation

• Gene Flow

• Bottle Neck Effect

• Even distribution of traits

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Which of the following is a mechanism that increases genetic variation within a population?

• Mutation

• Genetic Drift

• Natural Selection

• Bottleneck Effect

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What is the primary mechanism by which advantageous traits become more common in a population over time?

• Gene Flow

• Natural Selection

• Genetic Drift

• Mutation

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Which mechanism of evolution is most likely to occur when a small group of individuals colonizes a new habitat?

• Gene Flow

• Natural Selection

• Founder Effect

• Mutation